光纤光栅传感技术在分岔隧道模型中的实验研究

基于光纤光栅测量应变的诸多优势,将自制的光纤光栅传感器模块埋到分岔隧道三维地质力学模型中,在隧道开挖过程中,测量各埋入点的应变,将其与埋入相应点的应变片的测量结果以及数值分析结果进行了比较.结果表明,光纤光栅、应变片测得的结果与数值分析所得的结果趋势基本一致,但光纤光栅实测数据相比应变片测得数据更接近于仿真数据,并且可靠性高,在大型工程的长期监测中有较好的应用前景.

Experiment research of fiber grating sensor in the forked tunnel model

Based on the advantages of fiber grating in detecting strain, fiber grating sensor modules designed by our-selves were embedded in the three dimensional geo-mechanical model of a forked tunnel. In the process of tunnel digging, these sensors detect the strains of the embedded spots, which are compared with the results obtained from corresponding strain gauges and numerical analysis. Comparison results indicate that the trends of the data from fiber grating sensors, strain gauges and numerical analysis are basically consistent. However the data from fiber grating sensors are closer to the simulation data than those from strain gauges and have higher reliability. So the proposed method has good application future in long-term detection of large-scale engineering projects.